Online Forums

Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.

Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.

Do not use the Contact page for technical issues.

One or More opc server disconnect ，WriteMultipleValue() slowly

Start
Prev
1
Next
End

1

support
Offline
Moderator

More

17 Sep 2023 14:01 #12155 by support

Replied by support on topic One or More opc server disconnect ，WriteMultipleValue() slowly

Hello.

1 and 2. Are you addressing multiple servers inside one WriteMultipleXXXX operation? If so, the "writes" are generally performed in parallel, but because the WriteMultipleXXXX API is synchronous, all results must be delivered together, meaning that if there is a "delaying" problem connecting to at least one server, the whole method call will be delayed, until we have some result for all elements of the operation. This is by design. Same happens with multiple tags inside on server - if the server needs more time for one of them, the whole method call has to wait until we have all results.

If you are not addressing more servers inside one WriteMultipleXXXX , and still get unexpected delays even from servers that are otherwise "OK": Have you looked at the total CPU usage on the machine, and CPU usage of the process?

3. Need to know the details of the failures - what was the error message?

Regards

Please Log in or Create an account to join the conversation.

xpycy001
Topic Author
Offline
Elite Member

More

15 Sep 2023 09:02 - 15 Sep 2023 09:05 #12141 by xpycy001

One or More opc server disconnect ，WriteMultipleValue() slowly was created by xpycy001

Dear support:

1 Subscribing to more than 80 servers in a Client.exe, with one or more OPC server disconnected or offline, affects the performance of EasyUaClient.WriteMultipleValue , and often in write operations used several hundred milliseconds or 5 to 10 seconds or more

2 At the same time, I also noticed that if there are any problem tags, they can also affect the performance of the WriteMultipleValues()

3 Simultaneously, some writeMultipleValue() failures were found

I would like to confirm if the above issue is normal or if there is any way to solve it

Other information is as follows:
1 Windows server2019
2 opcUA Version Info: OpcLabs. QuickOpc 5.71.334
3 The main program is:. NET 7.0 console exe
4 used One EasyUaClient instance, subscribe & WriteMultipleValue, one time write about 10~50 tags value
5 OpcUaClient has subscribed to approximately 80 OpcServers with approximately 5000 Tags

2023-09-15 17:01

Last edit: 15 Sep 2023 09:05 by xpycy001.

Please Log in or Create an account to join the conversation.

Start
Prev
1
Next
End

1

Moderators: support

Time to create page: 0.041 seconds

Powered by Kunena Forum

Joomla SEF URLs by Artio